If you take creamer and like your coffee to be warm and not boiling-magma-hot you should consider freezing non-dairy creamer—you'll cool down your coffee while adding your preferred amount of creamer.

Reddit user wadel posted this tip. Most readers already know about freezing coffee itself to cool down your cup without dilution but if you take creamer you can kill two birds with one stone. You don't need to necessarily purchase single-serve packets of creamer for this trick, you could mix a bulk creamer and your preferred sweetener in a bowl and then freeze as ice cubes for a quick way to adjust coffee to your liking. Freezing real dairy cream doesn't work out quite as well.